In this paper, we investigate transceiver design for
a wideband multiuser-multiple-input, multiple-output (MIMO)
communication system, where the co-channel users are equipped
with multiple transmit and multiple receive antennas. In particular,
we develop a two-step hard-decision interference cancellation
receiver for a multiuser-MIMO uplink system which
employs orthogonal frequency division multiplexing (OFDM)
modulation and space-time block codes (STBC). The STBC has
been implemented either over adjacent tones or adjacent OFDM
symbols and the performances of both implementations have been
tested under slowly time-varying channels. The two-step receiver
structure has been implemented using a combined interference
suppression scheme based on minimum mean-squared error
(MMSE) and symbol-wise likelihood detectors, which is then
followed by an interference cancellation step. The receiver can
suppress and cancel the interference from the co-channel users
effectively without increasing the complexity significantly. The
paper also includes computer experiments that are intended to
improve the understanding of specific issues involved in the design
of multiuser STBC-OFDM systems.